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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 415 · 40 questions
TalentJR

How to do it in your head (Split, then double or halve): To double: split into tens and ones, double both, add. To halve: split into an even number of tens and the rest (156 = 140 + 16). Halve both parts and add.

NameDateTime takenScore ___ / 40
  1. 1.Half of 180 =
  2. 2.Half of 70 =
  3. 3.Half of 102 =
  4. 4.Half of 156 =
  5. 5.Double 94 =
  6. 6.Half of 92 =
  7. 7.Double 34 =
  8. 8.Half of 190 =
  9. 9.Half of 186 =
  10. 10.Double 46 =
  11. 11.Double 18 =
  12. 12.Double 92 =
  13. 13.Double 38 =
  14. 14.Half of 44 =
  15. 15.Half of 72 =
  16. 16.Double 89 =
  17. 17.Double 16 =
  18. 18.Half of 62 =
  19. 19.Double 37 =
  20. 20.Double 98 =
  21. 21.Double 39 =
  22. 22.Double 75 =
  23. 23.Half of 184 =
  24. 24.Half of 196 =
  25. 25.Half of 152 =
  26. 26.Double 83 =
  27. 27.Half of 88 =
  28. 28.Double 61 =
  29. 29.Double 85 =
  30. 30.Double 45 =
  31. 31.Half of 78 =
  32. 32.Half of 154 =
  33. 33.Double 81 =
  34. 34.Half of 198 =
  35. 35.Half of 176 =
  36. 36.Half of 182 =
  37. 37.Double 79 =
  38. 38.Double 31 =
  39. 39.Half of 122 =
  40. 40.Half of 104 =

Answer key

  1. 90
  2. 35
  3. 51
  4. 78
  5. 188
  6. 46
  7. 68
  8. 95
  9. 93
  10. 92
  11. 36
  12. 184
  13. 76
  14. 22
  15. 36
  16. 178
  17. 32
  18. 31
  19. 74
  20. 196
  21. 78
  22. 150
  23. 92
  24. 98
  25. 76
  26. 166
  27. 44
  28. 122
  29. 170
  30. 90
  31. 39
  32. 77
  33. 162
  34. 99
  35. 88
  36. 91
  37. 158
  38. 62
  39. 61
  40. 52

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